From Websters 1828 Dictionary (link)

Periphrastic PERIPHRAS'TIC
PERIPHRAS'TICAL, a. Circumlocutory; expressing or expressed in more words than are necessary; expressing the sense of one word in many.

From WordNet (r) 2.1 (2005) (link)

  periphrastic
      adj 1: roundabout and unnecessarily wordy; "had a preference for
             circumlocutious (or circumlocutory) rather than
             forthright expression"; "A periphrastic study in a worn-
             out poetical fashion,/ Leaving one still with the
             intolerable wrestle/ With words and meanings."-T.S.Eliot;
             (`ambagious' is archaic) [syn: circumlocutious,
             circumlocutory, periphrastic, ambagious]

From Merriam-Webster's Collegiate Dictionary, 11th Edition (2003) (link)

  periphrastic adjective
   Date: 1805 1.  of, relating to, or characterized by periphrasis
   2.  formed by the use of function words or auxiliaries instead of by
   inflection  <more fair is a periphrastic comparative>
   • periphrastically adverb
  
  

From Oxford English Reference Dictionary (link)

periphrastic
adj. Gram.
1 of or involving periphrasis.
2 (of a case, tense, etc.) formed by combination of words rather than by inflection (e.g. did go, of the people rather than went, the people' s).
Derivatives:
periphrastically adv.
Etymology: Gk periphrastikos (as PERIPHRASIS)

From English Explanatory Dictionary (link)

  periphrastic
  ˌperɪˈfræstɪk adj. Gram. 1 of or involving periphrasis. 2
  (of a case, tense, etc.) formed by combination of words rather than by
  inflection (e.g. did go, of the people rather than went, the people'
  s). øøperiphrastically adv. [Gk periphrastikos (as PERIPHRASIS)]
  
  
  

From Webster's Revised Unabridged Dictionary (1913) (link)

  Periphrastic \Per`i*phras"tic\, Periphrastical
  \Per`i*phras"tic*al\, a. [Gr. ?: cf. F. p['e]riphrastique.]
     Expressing, or expressed, in more words than are necessary;
     characterized by periphrase; circumlocutory.
  
     Periphrastic conjugation (Gram.), a conjugation formed by
        the use of the simple verb with one or more auxiliaries.

From Soule's Dictionary of English Synonyms (link)

  periphrastic
  a. ; (also periphrastical)
   Circumlocutory, roundabout, indirect, going round.